I ( or I should say my mother) have 3 cats. To my knowledge they're fed regular cat food, dry of course, at their own pace. What I mean by that is we leave a food bowl out for them to eat when they want. Anyway. Whenever they use the litter box to poop, the whole basement becomes this maelstrom of horrid fecal aroma. I put odor eaters, spray Lysol and used the odor absorbing litter even but to no avail. Is it normal for my cats shit to smell this bad??? What can I do to remedy this???